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An in-depth look at some of the world's most dangerous murderers.
S8, EP9 "Billy Mansfield Jr."
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
S8, EP8 "Richard Paul White"
Police in Aurora, Colorado find the body of a young man in his own home with a bullet wound to the head.
S7, EP8 "Adrian Prout"
A master manipulator is accused of the murder of his wife, and is eventually caught out by a polygraph test - and his own fiancée.
S7, EP16 "Heriberto Seda"
A killer who goaded police and media during his spree, Heriberto Seda claimed to kill based on his victims' star signs.
S8, EP20 "Eric Locke"
Dublin man Eric Locke refuses to accept it when Sonia Blount, a mother of one, ends their relationship.
S8, EP19 "Catherine Nevin"
Catherine Nevin reports a break-in and violent attack at her pub, which leaves her husband dead.
S8, EP18 "Charlotte and Linda Mulhall"
In March 2005, the gardaí recover human body parts from the Royal Canal in Dublin.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
